{"assessment":{"best_window":{"end":"2027-11-20T00:00Z","end_local":"02:00","hours":7.42,"label":"good","mean_quality":0.85,"start":"2027-11-19T16:35Z","start_local":"18:35"},"cost":{"altitude":0.0,"clouds":0.0,"darkness":2.62,"moon":2.97},"formula":"astronomy = 100 * min(1, sky_hours / reference_hours) * peak_sky; overall = astronomy * score_weather / 100 (null when the weather is unknown)","hard_limit":null,"headline":"Astronomically worth it \u2014 weather unknown","hourly":[{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T15:00Z","label":"unusable","low":null,"mid":null,"moon_alt":-31,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"17:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T16:00Z","label":"poor","low":null,"mid":null,"moon_alt":-31,"precip":null,"q":0.15,"rh":null,"sky":"nautical twilight","temp":null,"time":"18:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T17:00Z","label":"good","low":null,"mid":null,"moon_alt":-27,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"19:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T18:00Z","label":"good","low":null,"mid":null,"moon_alt":-21,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"20:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T19:00Z","label":"good","low":null,"mid":null,"moon_alt":-13,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"21:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T20:00Z","label":"good","low":null,"mid":null,"moon_alt":-4,"precip":null,"q":1.0,"rh":null,"sky":"night","temp":null,"time":"22:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T21:00Z","label":"good","low":null,"mid":null,"moon_alt":6,"precip":null,"q":0.72,"rh":null,"sky":"night","temp":null,"time":"23:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T22:00Z","label":"good","low":null,"mid":null,"moon_alt":16,"precip":null,"q":0.68,"rh":null,"sky":"night","temp":null,"time":"00:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-19T23:00Z","label":"good","low":null,"mid":null,"moon_alt":27,"precip":null,"q":0.64,"rh":null,"sky":"night","temp":null,"time":"01:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T00:00Z","label":"marginal","low":null,"mid":null,"moon_alt":37,"precip":null,"q":0.6,"rh":null,"sky":"night","temp":null,"time":"02:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T01:00Z","label":"marginal","low":null,"mid":null,"moon_alt":48,"precip":null,"q":0.56,"rh":null,"sky":"night","temp":null,"time":"03:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T02:00Z","label":"marginal","low":null,"mid":null,"moon_alt":56,"precip":null,"q":0.54,"rh":null,"sky":"night","temp":null,"time":"04:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T03:00Z","label":"marginal","low":null,"mid":null,"moon_alt":62,"precip":null,"q":0.53,"rh":null,"sky":"night","temp":null,"time":"05:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T04:00Z","label":"poor","low":null,"mid":null,"moon_alt":62,"precip":null,"q":0.26,"rh":null,"sky":"astronomical twilight","temp":null,"time":"06:00","wind":null},{"alt":null,"cloud":null,"high":null,"iso":"2027-11-20T05:00Z","label":"unusable","low":null,"mid":null,"moon_alt":58,"precip":null,"q":0.0,"rh":null,"sky":"civil twilight","temp":null,"time":"07:00","wind":null}],"peak_quality":1.0,"peak_sky":1.0,"quality_hours":8.83,"reasons":["moonlight cost 3.0 quality-hours","daylight and twilight cost 2.6 quality-hours"],"reference_hours":4.0,"score":null,"score_astronomy":100,"score_weather":null,"sky_hours":8.83,"verdict":"unknown","verdict_astronomy":"good","weather_known":false,"windows":[{"end":"2027-11-19T15:30Z","end_local":"17:30","hours":0.58,"label":"unusable","mean_quality":0.0,"start":"2027-11-19T14:55Z","start_local":"16:55"},{"end":"2027-11-19T16:05Z","end_local":"18:05","hours":0.58,"label":"poor","mean_quality":0.15,"start":"2027-11-19T15:30Z","start_local":"17:30"},{"end":"2027-11-19T16:35Z","end_local":"18:35","hours":0.5,"label":"marginal","mean_quality":0.5,"start":"2027-11-19T16:05Z","start_local":"18:05"},{"end":"2027-11-20T00:00Z","end_local":"02:00","hours":7.42,"label":"good","mean_quality":0.85,"start":"2027-11-19T16:35Z","start_local":"18:35"},{"end":"2027-11-20T03:40Z","end_local":"05:40","hours":3.67,"label":"marginal","mean_quality":0.55,"start":"2027-11-20T00:00Z","start_local":"02:00"},{"end":"2027-11-20T04:50Z","end_local":"06:50","hours":1.17,"label":"poor","mean_quality":0.17,"start":"2027-11-20T03:40Z","start_local":"05:40"},{"end":"2027-11-20T05:20Z","end_local":"07:20","hours":0.5,"label":"unusable","mean_quality":0.0,"start":"2027-11-20T04:50Z","start_local":"06:50"}]},"calculation_version":"2026-10-10.1","forecast":[],"forecast_source":"none","forecast_updated_at":null,"limits":{"good_alt":30.0,"usable_alt":20.0},"night":{"dark_from":"2027-11-19T16:34:46Z","dark_hours":11.06,"dark_to":"2027-11-20T03:38:32Z","moon":{"illumination":0.626,"phase":"waning gibbous","waxing":false},"moon_free_dark_hours":3.87,"moonrise":"2027-11-19T20:27:10Z","moonset":"2027-11-19T10:04:26Z","sunrise":"2027-11-20T05:15:40Z","sunset":"2027-11-19T14:57:50Z","twilight":{"astronomical":{"end":"2027-11-19T16:34:46Z","start":"2027-11-20T03:38:32Z"},"civil":{"end":"2027-11-19T15:27:58Z","start":"2027-11-20T04:45:28Z"},"nautical":{"end":"2027-11-19T16:01:47Z","start":"2027-11-20T04:11:34Z"}},"window_end":"2027-11-20T10:00:00Z","window_start":"2027-11-19T10:00:00Z"},"night_date":"2027-11-19","site":{"elev_m":1750,"lat":41.693,"lon":24.739,"name":"NAO Rozhen"},"warnings":["No cloud data for this night (beyond the 4-day forecast, or not yet in the archive) \u2014 the score is geometry only."]}